Matthew Decker
- Full Name: Matthew Decker
- Species: Human
- Gender: Male
- Daughter: Joan Decker
- Son: Williard Decker
- By 2246: Chief of security, Starfleet; Starbase 4 (BatB Novel: The First Artifact)
- By 2263: Commodore, commanding officer, Starfleet; USS Constellation (VAN Novel: Harbinger)
- Death: July 17, 2267; Planet killer (TOS: "The Doomsday Machine")
- Killed during attempt at destroying the planet killer weapon (TOS: "The Doomsday Machine")